Advantage depends

I know most of you are thinking landscape usage in a smaller custom 5X8 camera or back

I bought NOS horizontal 8x10 Deardorff slider from an esteemed LFPF member some years ago

No need to cut film down from 8x10 until perhaps after shooting

Think Diptychs, and the 2 second delay for portraits which often gives a better pose

I don't know of any 5X8 developing hangers and I always process with 8x10 hangers

If both shots work, print the entire 8X10

I have used sliders on 4X5 making 2 and 4 up

and have a few more slider formats

An ongoing current project is Triptychs